Robust H&amp;#x221E; controller design for microgrid-tied inverter applications

Jankovic, Zeljko; Nasiri, Adel; Wei, Lixiang

doi:10.1109/ecce.2015.7309993

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…A small tracking error means that the gain of S ( s ) must be low at the frequency of the line or in a small neighbourhood around the frequency of the line

false(w_{1} = 2 π 60 rad / s)

. In other words, a strong attenuation at the frequency of 60 Hz and in the vicinity must be considered for a low‐order harmonic attenuation [51].…”

Section: Selection Of Weighting Functionsmentioning

confidence: 99%

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Bouzid

Sicard

Chaoui

et al. 2019

IET Power Electronics

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This study proposes a cascaded voltage-current robust control strategy for a distributed generator (DG) in microgrids. The main objective of the proposed controller is to improve the performance and power quality of a DG by injecting simultaneously a good sinusoidal voltage/current to the different loads connected to the DG. The proposed cascaded voltage/ current controller consists of three degree-of-freedom controller, which is designed by using H∞ control theory based on mixed sensitivity specifications. The choices of appropriate weighting functions W t , W u , W y that satisfy the preset goals to get a robust controller and a transform to a standard H∞ control design problem based on pre-compensator, feedforward and feedback connections are presented. The 3DOF-controller is based on MATLAB R/SimPowerSystems and using RT-EVENTS-toolbox. The controller is evaluated under different scenarios: transient responses with a resistive local load, and loads disturbances in steady-state responses with resistive, resistive inductive, resistive capacitive, and non-linear loads. Simulation and experimental results of resulting waveforms from a DG unit are presented, it confirms the effectiveness of the proposed method in effectively rejecting perturbation and robustness to loads disturbances; both good reference tracking and good transient response, and finally significantly lead to a very low total harmonic distortion.

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“…A small tracking error means that the gain of S ( s ) must be low at the frequency of the line or in a small neighbourhood around the frequency of the line

false(w_{1} = 2 π 60 rad / s)

. In other words, a strong attenuation at the frequency of 60 Hz and in the vicinity must be considered for a low‐order harmonic attenuation [51].…”

Section: Selection Of Weighting Functionsmentioning

confidence: 99%

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Bouzid

Sicard

Chaoui

et al. 2019

IET Power Electronics

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“…The authors in [30][31][32][33][34][35][36][37][38][39][40][41][42] applied the H∞ control for adjusting a single parameter such as voltage, current, frequency, power quality or management. This paper presents a robust, adaptive and repetitive control method for MGs in an off-grid mode based on the H∞ control method.…”

Section: Introductionmentioning

confidence: 99%

“…Jian and Chaoli [34] applied the particle swarm optimisation (PSO) to optimise the weighting function of the H∞ controller to reduce the frequency fluctuations due to integrating DGs with MG. Also, the H∞ control method applied in [35] to ensure a power balance and reduce frequency fluctuations. Moreover, it is used to control the current and voltage in the DC–AC interface of micro‐sources in MGs [36, 37]. The H∞ controller was used in MGs to improve the power quality [38], reduce THD [39], control the MG under the uncertainties of the load changes [40], control the frequency fluctuations [41], and control the grid tied inverters [42].…”

Section: Introductionmentioning

confidence: 99%

Robust adaptive H‐infinity based controller for islanded microgrid supplying non‐linear and unbalanced loads

et al. 2019

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This study introduces a proposed control method for microgrids (MGs) in islanded (off-grid) mode. The proposed control method is developed by modifying the droop control method using H-infinity controller. In this control method, the droop control loop, current and voltage control loops are adjusted to respond to system load variation. The proposed method is an adaptive control one as it regulates the system voltage and frequency to their nominal values after system load variations. Also, it is a repetitive control method as it depends on the internal model principle that provides good performance for voltage and current error tracking. To prove the applicability and effectiveness of the proposed method, it is applied to a test system using MATLAB/Simulink under three different loading conditions. The results are compared with those of droop control and they prove the effectiveness of the proposed method in adjusting MGs under the off-grid mode of operation. Also, a system stability analysis is performed based on root locus and system step response. Robustness analysis is performed to prove the ability of the proposed controller to restore the system performance after the fault clearance.

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“…34 An internal model is also applied to the H∞ controller to provide a repetitive control method that eliminates periodic errors in dynamic systems. 35 Authors in previous studies [36][37][38][39][40][41][42][43] apply the H∞ controller to adjust one parameter in islanded MG. For adopting the output control signals and optimally provide a trade-off between the robustness and performance in H∞ closed loop, two weighting parameters ξ and μ are used. Literature review shows that H∞ controller can be used for controlling MG under its two modes of operations.…”

Section: Introductionmentioning

confidence: 99%

“…Literature review shows that H∞ controller can be used for controlling MG under its two modes of operations. It was applied to control the VSI that tied MG 36 and to adjust the system frequency 37‐39 . It was also applied to adopt the system voltage 40 and the LCL filter current 41 .…”

Section: Introductionmentioning

confidence: 99%

A multistage H‐infinity–based controller for adjusting voltage and frequency and improving power quality in islanded microgrids

Sedhom

El‐Saadawi

Hatata

et al. 2019

Int Trans Electr Energ Syst

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Summary This paper proposes a novel methodology for controlling voltage and frequency of islanded microgrids and meanwhile improving the system power quality. The proposed methodology is based on applying a multi‐stage H‐Infinity (H∞) controller with different control loops to restore the nominal values of voltage and frequency after any load variation. These control loops include power control, current control, and voltage control loops. The H∞ is also applied with an LCL filter to enhance the system power quality. The proposed controller is applied to a test system under three different loading conditions and the obtained results are compared with that obtained by applying the model predictive control (MPC) method. The results are compared with that obtained by applying a proposed traditional control method in the same test system. A comparison between the droop controller and the proposed controller, MPC is performed based on fitness value, controller response time, and maximum frequency deviation. In addition, the system stability is analysed using root locus, system step response, singular value decomposition, and bode diagram. The results prove the effectiveness and the efficiency of the proposed method in restoring voltage and frequency and improving the system power quality.

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Robust H∞ controller design for microgrid-tied inverter applications

Cited by 8 publications

References 12 publications

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Robust adaptive H‐infinity based controller for islanded microgrid supplying non‐linear and unbalanced loads

A multistage H‐infinity–based controller for adjusting voltage and frequency and improving power quality in islanded microgrids

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